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Finding the Fourth Proportional to 115.50, 173.20 and 42.36

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Solution

The fourth proportional to 115.50, 173.20 and 42.36 is: 63.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.50 : 173.20 = 42.36 : x
  2. Step 2: Convert to fraction form
    115.50/173.20 = 42.36/x
  3. Step 3: Cross multiply
    115.50x = 173.20 × 42.36
  4. Step 4: Simplify right side
    115.50x = 7,336.16
  5. Step 5: Solve for x
    x = 7,336.16/115.50
  6. Step 6: Final answer
    x = 63.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.